Operation CHARM: Car repair manuals for everyone.
Home >> Audi >> 1998 >> A8 Sedan (4D2) V8-3.7L (AEW) >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Testing and Inspection >> Component Tests and General Diagnostics >> Motronic/Auto Transmission Data Exchange (Can-Bus), Checking
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

Motronic/Auto Transmission Data Exchange (Can-Bus), Checking




- Check Diagnostic Trouble Code (DTC) memory for Transmission Control Module (TCM).

- Switch ignition off.





- Connect VAG 1598/19 test box to ECM harness connector. Connecting VAG 1598/19 Test Box
- Check wiring for open or short circuit between TCM and ECM/test box sockets A9 and A10.
See Electrical Wiring Diagrams, Troubleshooting and Component Locations.

If wiring is OK:
- Temporarily replace ECM and/or TCM.
- Generate readiness code. Readiness Code, Generating


pro multis · About Operation CHARM